You could try r.out.xyz for each layer , then join the columns .

http://grass.fbk.eu/grass64/manuals/html64_user/r.out.xyz.html
Doug Newcomb 
USFWS
Raleigh, NC
919-856-4520 ext. 14 doug_newc...@fws.gov
---------------------------------------------------------------------------------------------------------
The opinions I express are my own and are not representative of the 
official policy of the U.S.Fish and Wildlife Service or Dept. of the 
Interior.   Life is too short for undocumented, proprietary data formats.



sarthakahuja <sarthakah...@gmail.com> 
Sent by: grass-dev-boun...@lists.osgeo.org
09/09/2011 03:37 PM

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Subject
[GRASS-dev] export question






I am trying to export an image to an excel file having lat, long, rgb 
values
for all the points on the image. Does anyone know where I should look, 
have
some idea...any help would be greatly appreciated

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